Around a month later, Bieber swung back via an interview with Billboard. He totally hashed her name up and referred to the stage-and-screen legend as "Britt Meddler," and then followed with, 'Who is this lady?'

Seriously?

.@justinbieber Britt Meddler! I don't know who that is either! But damn that bitch!

2. Ariana Grande

In December 2015 Midler discussed the pornification of pop music with Telegraph and picked out singer Ariana Grande to illustrate her point:

“It’s terrible! It’s always surprising to see someone like Ariana Grande with that silly high voice, a very wholesome voice, slithering around on a couch, looking so ridiculous. I mean, it’s silly beyond belief and I don’t know who’s telling her to do it. I wish they’d stop. But it’s not my business, I’m not her mother. Or her manager. Maybe they tell them that’s what you’ve got to do. Sex sells. Sex has always sold.”

Grande was reportedly (and understandably) taken aback by the harsh critique, prompting Midler to issue the below sorry-not-sorry tweet:

About my screed on @ArianaGrande , all I can say is, "Spoken like a reformed old whore! She does have a beautiful voice, on a couch or off."

6. Lady Gaga

Everything you can do, Bette can do better and has probably done already — something Lady Gaga learned the hard way in 2011 when she was publicly accused of ripping off Midler's mermaid-in-a-wheelchair shtick.

Dear @ladygaga if you think a mermaid in a wheelchair seems familiar-it's because it is!You can see it on youtube 24/7-with ME performing it